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puffed battery question

So I purchased to 2 slashes they came with 2 3 cell lipos. These batteries have been charged on a non balanced charged. Obviously they need to be tossed asap and they will. One is very slightly puffed.

But here is a question. I ordered replacements but in the meantime if I were to charge the battery outside in a lipo safe bag. and keep them outside. Is there a real risk? My thought is to use them for a few days an keep them outside. if they explode while changing they will be outside away from the house on a cement slab.

Lipo's don't really explode, when they rupture they spit out liquid fire for quite some time. I had a small 500mah lipo for a heli rupture and it took about 3min for it to stop, I can only imagine how long a large battery would burn. Even if they were charged successfully in a safe place, I would be concerned about catching my truck on fire when using them.

That depends on how far out of balance they are.
Most of the early issues with LiPo was due to unbalanced cells. They would drift, getting further and further apart during both use and charging. You see, when just pack voltage is looked at one cell can be severely over charged to make up for the cell that is low in order to reach proper pack voltage. The same is true during use because LVD equipped ESC's only check pack voltage.... allowing the low cell to get dangerously low because the high pack is making up the most of the voltage. This process severely stresses out each cell in the pack, causing them to puff.

Found the warranty and it said Traxxas will replace any battery that found to be defective at no cost for the first year of ownership, but this pack wasn't charged properly and benalexe wasn't the original owner so it won't count. After the first year Traxxas will exchange any of their batteries in any condition for a new one at 50% of the new pack's retail price. I don't think counts since the lipo could be unsafe.